linux-kernel - Re: [PATCH bpf v4] bpf: Fix theoretical prog_array UAF in __uprobe_perf

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Message-Id: 
 <173386622902.984066.17756652143302232987.git-patchwork-notify@kernel.org>
Date: Tue, 10 Dec 2024 21:30:29 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jann Horn <jannh@...gle.com>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, rostedt@...dmis.org,
 mhiramat@...nel.org, mathieu.desnoyers@...icios.com, delyank@...com,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf v4] bpf: Fix theoretical prog_array UAF in
 __uprobe_perf_func()

Hello:

This patch was applied to bpf/bpf.git (master)
by Andrii Nakryiko <andrii@...nel.org>:

On Tue, 10 Dec 2024 20:08:14 +0100 you wrote:
> Currently, the pointer stored in call->prog_array is loaded in
> __uprobe_perf_func(), with no RCU annotation and no immediately visible
> RCU protection, so it looks as if the loaded pointer can immediately be
> dangling.
> Later, bpf_prog_run_array_uprobe() starts a RCU-trace read-side critical
> section, but this is too late. It then uses rcu_dereference_check(), but
> this use of rcu_dereference_check() does not actually dereference anything.
> 
> [...]

Here is the summary with links:
  - [bpf,v4] bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()
    https://git.kernel.org/bpf/bpf/c/7d0d673627e2

You are awesome, thank you!
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